Duplex rotary pump



Jan. 15, 1929.

J. F. JAWOROWSKI DUPLEX ROTARY PUMP Filed April 29, 1924 TF5. Z.

2 Sheets-Sheet 1 I INVENTOR J. EJAwoRowsKi MMMIW ATTORNEYS Jan. 15, 1929. 1,698,815

- J. F. JAWOROWSKI DUPLEX ROTARY PUMP Filed April 29, 1924 2 Sheets-Sheet 2 JEi z y 42 l 1: 4,2 lie-.

22 23. 9* v I 8 Z6 3? INVENTOR L J.F.Jl\woRowsK| 1 ATTORNEYS Patented Jan. 15, 1929.

STATES JOSEPH F. JAWOROWSKI, OF CLEVELAND, OHIO.

DUPLEX ROTARY PUMP.

Application filed April 29, 1924. Serial No. 709,783.

The present invention relates to an improvement in a double-acting rotary pump or compressor, and in general my object is to provide a compact rotary device adapted to compress or pump a fluid or liquid with a high degree of efficiency. The device is particularly constructed to produce a steady flow and uniform pressure; to operate at high speed; to permit convenient assembly and disassembly; to promote smooth and noiseless operation; and to reduce production and operating costs.

In the accompanying drawings, Fig. 1 is a vertical section of my improved doubleacting rotary pump compressor on line 11 of Fig. 2. Fig. 2 is a vertical section centrally through the device on line 22 of Fig. 1. Fig. 3 is a sectional view of the upper portion of the device on line 33 of Fig. 2. Fig. 4 is a horizontal section of a portion of the body on line 44 of Fig. 1. Fig. 5, Sheet 2, is a horizontal section of the device on line 55 of Fig. 1. Fig. 6 is a perspective and sectional view of the main body. Fig. 7 is a F perspective view of the complete device.

The invention comprises a chambered main body 2 which is cast in one piece and embodies an integral base 3 and a central circular portion containing two round chambers 4 and 5 arranged co axially on opposite sides of a central Wall or diaphragm 6. The upper part of body 2 is of substantially oval shape and contains two elongated chambers 7 and 8 having a communicating passage or opening 9 in wall 6 opposite a centrally situated vertical outlet 10 at the top of body 2. A lateral boss 11 or pipe connection extends from one side wall of body 2, and an intake passage 12 therein communicates with a round bore or opening 14 which is drilled through body 2 at right angles to passage 12. Opening 14 extends completely through body 2 from its flat front face 15 to its fiat rear face 16, and tWo slots 1717 extend from one side of opening 14 into the separate round I chambers 4 and 5, respectively, see Fig. 6.

These round chambers also have communicating passages 18 with the upper chambers 7 and 8, at points closely adjacent slot 17, as shown in Fig. 1, and one side wall of each opening 18 above slot 17 is curved, and adapted to be engaged by an abutment blade 19 which projects downwardly from one end of an arm 20 which is pivotally supported upon a pivot pin 21 extending through wall 6 into said chambers 7 and 8, respectively.

Pivot pin 21 is supported at its middle within wall 6, and its opposite ends permit the separate arms 20 to be rotatably sleeved thereon on opposite sides of wall 6 in the adjacent chambers 7 and 8, and to be slipped into place or removed whenever the front and rear closure plates 22 and 23 are detached from body 2. The free ends of arms 20 are provided at the top thereof with sockets 24 adapted to. seat the round heads 25 of a pair of vertical rods 26 which are loosely seated at their upper ends within tubular nuts 27 screwed into the top of body 2. Separate coiled compression springs 28 are sleeved upon rods 26 in engagement with nuts 27 and heads 25,, so that arms 20 may be placed under a light spring pressure. However, the horizontal operating position of arms 20 above the rolling rotors 30 and 31 within chambers 4 and 5, respectively, afford a gravity working relationship between the parts.

Moreover, the contact end of each curved abutment blade 19 is cut away inpart at 32 at its convex side adjacent slot 17 to promote constant riding engagement of said abutment against the periphery of the round rotors, it having been discovered in practice that the notching of the blades and formation of a shoulder at 32 immediately adjacent slot 17, is vitally effective in the operation of the oscillatory abutment member 19 under the high rate of speed at which this pump is adapted to operate with maximum efficiency. Said notched portion is on the intake side of the rotor and compression is on the opposite side thereof, so that blade 19 is constantly pressed against the rotor members by the suction and pressure created .within the device when the rotor members are revolving. The springs may be omitted, but have been found desirablein promoting starting opera tions and to overcome friction.

The round rollers or rotors 30 and 31 are placed in a counter-balancing position upon a drive shaft 33, which is formed with eccen trio enlargements or round crank portions 34 upon which the bushings of the rollers are adapted to be sleeved. .The crank portions 34 are diametrically offset to counterbalance the rollers and also cause a uniform pressure and flow of the fluid or liquid at the common outlet 10 for both chambers 7 and 8.

The suction effects produced in the two rotor chambers 4 and 5 are alike because the .two intake slots 17-17 communicate with a common intakepassage 12 situated midway elongated hub 37 on cover plate 28.

between said slots, and the outlet 10 is also situated centrally between the two chambers 7 and 8 and'their communicating passage 9. Thus, the operation of the pump is perfectly balanced and a constant steady flow or pressure is maintained on the line by the double acting working parts within the device.

Cover plate 22 has a hollow hub or extension 36 which is closed at its outer end and within which one end of shaft 33 is journaled, and the opposite end of the shaft is longer and extends completely through in n adjustable nut 38,, a packinggland 39, and suitable packing 40 are associated with hub 37 to prevent leakage around shaft 33. Dowel pins 41 may also be used to set and fix the cover plates 22 and 23 upon body 2, and suitable gaskets may be interposed betweenthe cover plates and the body if desired. As shown these cover plates are detachably fastened to the body by screws 42.

Shaft33 may be rotated at high speed by means of a pulley or gearing and in this operation the two eccentric rotors 3&-3t roll in a circular orbit in constant rolling contact with the circular wall of their respective chambers. In this operation the abutment blades 19 divide the crescentshaped working chambers into separate suction and compression spaces, and the suction space of each working chamber isin constant open communication with the main intake 12, and the com ression side is constantly open to ohambers i and 8, and common outlet 10.

The double rolling rotors being diametrically offset on the same shaft and confined in the separate working chambers on opposite sides of the central wall or diaphragm 6, a continuous non-pulsating flow is obtained permitting the pump to be used for the most exacting installation and giving a constant torque on the driving shaft which saves power and adds to the durability of the pump. The rolling contact of the rotors eliminates friction and if Wear takes place on the roller bushings or crank shaft the inertia of the revolving roller is directed outward and constantly maintains this rolling contact and sealing relation with the cylinder wall. Thus, high compression and a high vacuum may be created, making priming of the pump unnecessary. The working parts are reduced to a minimum and may be readily taken apart and reassembled or replaced without expert knowledge or special tools.

What I desire to claim is:

1.-A double-acting rotary pump or comsaid body also having an intake passage'at one side and a pair of slots open thereto and to said round chambers at each side of said wall and provided with communicating passages between said round chambers and outlet chamber opposite said slots, separate rolling rotors within said chambers, a common operating shaft for said rotors, and separate pivoted arms mounted upon said pin within said outlet'chamber at each side of said division wall having curved abutment blades extending through said communicating passages into contact with said rotors opposite said slots.

2. A double-acting pump or compressor, comprising a chambered body having a vertical division wall and a transverse Wall providing pairs of round and elongated chambers arranged one above the other on opposite sides of said wall, each pair of chambers being provided with communicating passages, a single inlet extending transversely through said body having intake slots for each round chamber, a common outlet for said elongated chambers situated centrally at the top of said body, a crank shaft extending through said round chambers, rolling rotor members mounted upon said shaft within said round chamber, a cross pin supported at its middle within said division wall andextending into one end of each elongated chamber, and arms pivoted upon opposite ends of said pin having curved abutment blades extending through said communicating passages into contact with said rotor members directly opposite said intake slots.

3. A double-acting pump or compressor, comprising a body having co-axial round chambers on opposite sides of a central division wall and separate elongated chambers above said round chambers having a centrally-situated communicating passage eX- tending through said Wall and an outlet opening cxtending'verticallyfrom said passage opposite said division wall, said body also having an intake cross bore extending through the opposite sides thereof and slots extending from one side of said cross bore into said round chambers, said slots extend ing horizontally in intersecting relation to a pair. of vertical communicating passages between said round and elongated chambers, abutment blades extending through said ver tical communicating passages having notched and shouldered corner portions adapted to register with the discharge side of said slots, said blades being pivotally mounted for independent movement within said elongated chambers, rolling rotor members mounted within said round chambers, and a doublecrank shaft for said rotor members.

In testimony whereof I aflix my signature. 

